APA

Hemming R., Keen M. J., .Single-crossing conditions in comparissons of tax progressivity. : .

Chicago

Hemming Richard, Keen M J, .Single-crossing conditions in comparissons of tax progressivity. : .

Harvard

Hemming R., Keen M. J., .Single-crossing conditions in comparissons of tax progressivity. : .

MLA

Hemming Richard, Keen M J, .: . .